The pretreatment of refractory polyvinyl-alcohol(PVA) wastewater with low value of CODCr by Fenton's reagent was investigated to enhance the biodegradability.The effects of operating conditions such as pH of the solution,Fe2+ dosage,H2O2 dosage,reaction time and initial PVA concentration on the removal efficiency of CODCr were discussed.It is demonstrated that the optimum value of pH for removal of CODCr is 5 and the most suitable dosages of H2O2(2%) and FeSO4(10 mg/L) are 5% and 8.0%,respectively.When the initial CODCr value of the PVA water is 760 mg/L,the favorable reaction time is 110 min.Under these optimum conditions,the removal ratio of CODCr is 58.6%-61.4%,and the value of biodegradability(CODB/CODCr) increases markedly from 8.9%-9.7% to 62.6%-68.3%.
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